How to unregister service workers
For Mozilla Firefox users
Press F12 to open web developer tools while visiting Simple Diagram.
Go to the Storage tab.
Delete caches from Cache Storage.
Open a new tab and enter about:serviceworkers in the address bar. It will list all service workers registered in your firefox after pressing Enter
key.
Find service workers registered by Simple Diagram and click on the Unregister button to disable it.
For Google Chrome users
Press F12 or CTRL+SHIFT+I to open web developer tool.
Go to the Application tab.
Click on the Service Workers in the left bar.
Click on Unregister to disable service workers.
Delete caches from Cache Storage.